Power driven file

ABSTRACT

An electric motor power driven file consisting of an electric motor enclosed in a handle and operatively connected by bevel gears to an adjustable chuck adapted to receive therein the butt end of various sizes and configurations of files, the bevel gears converting the rotational movement of the motor to reciprocal translational motion for the file.

United States Patent [1 1 Lee Feb. 25, 1975 [54] POWER DRWEN FILEFOREIGN PATENTS OR APPLICATIONS 1 lnvemorl Robe" 20th, 246,312 9/1947Switzerland 29/76 E cana 1 h 49829 232,694 9/1944 Switzerland 29/76 [22]Filed: Feb. 22, 1974 [21] A l N 444 795 Primary ExammerLeomdas Vlachospp. 0.: Y

I [57] ABSTRACT An electric motor power driven file consisting of anFie'ld R 76 A electric motor enclosed in a handle and operatively rconnected by bevel gears to an adjustable chuck R erenc Cit d adapted toreceive therein the butt end of various sizes e es e and configurationsof files, the bevel gears converting UNITED STATES PATENTS therotational movement of the motor to reciprocal 348,664 5/1886 Krayer29/76 X translational motion for the file. 2,24 ,755 5/1941 Briggs 29/76X 3,465,601 9/1969 Wezel et al. 29/76 x 1 Clalm, 6 Drawing Flgures POWERDRIVEN FILE BACKGROUND OF THE INVENTION to minimize this time elementthe priorart discloses rotary type files adapted to be driven byelectric drill type structures and the like in the general form of arotary grinding wheel. However, such filing devices do not provide thedesired result as achieved by conventional elongated files operated in areciprocating manner so that such powered files of the prior art havenot been well received by industrial users.

SUMMARY OF THE INVENTION The present invention recognizes theindustrialneed for a'power driven file providing the conveniences and advantagesof present manual files, and provides a novel solutionthereto whichremedies and overcomes all of the deficiencies and disadvantages ofpresently available power files. The present invention provides a novelpower driven file which is of a small and convenient configurationreadily held in an individual s hands and whereby a variety of filingblades may be used therewith in an interchangeable manner with each ofsuch blades being reciprocally driven in a manner substantiallyidentical to hand manipulation of the file so that the desired filing isaccomplished 'in the desired manner with the volume of work outputgreatly increased without any decrease or adverse affect in the qualityof the'work performed. Y

It is a feature of the present invention to provide a power driven filewhich is powered by an electric motor.

It is a further feature of the present invention to provide a powerdriven file which is of a lightweight and compact configuration andwhich is readily utilizable with filing blades of various sizes andconfigurations.

Still a further feature of the present invention provides a power drivenfile which is relatively simple in its construction and which thereforemay be readily manufacturedat a relatively low cost and by simplemanufacturing methods.

Yet still a further feature of the present invention provides a powerdriven file which is of a rugged and durable construction and whichtherefore may be guaranteed by the manufacturer to withstand many yearsof intended usage.

Still yet a further feature of the present invention provides a powerdriven file which is easy to use and reliable and efficient inoperation.

Yet still a further feature of the present invention provides a powerdriven file which can be retailed at a sufficiently low price toencourage its widespread use in view of its time saving advantages -overmanual file manipulation.

Other features and advantages of this invention will be apparent duringthe course of the following descript1on.

I BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings forminga part of this specification, and in which like reference characters areemployed to designate the same:

FIG. 1 is a perspective view of the power driven file of the presentinvention;

FIG. 2 is a front elevational view of the file partially broken away toillustrate interior details thereof;

FIG. 3 is a top plan view of the file partially broken away toillustrate interior details thereof;

FIG. 4 is a side elevational view similar to FIG. 2 illustrating adifferent operating position of the file;

FIG. 5 is an exploded perspective view of the chuck assembly and atypical file blade for use therewith; and

' FIG. 6 is a perspective view of a rattail type file blade intended foruse with the power file.

Referring now to the drawings in detail there is illustrated a preferredform of a power driven file constructed in accordance with theprinciples of the present invention and designated generally in itsentirety by the reference numeral 10 and which is comprised of a housing11, and electric motor 12, a drive assembly 14, a chuck assembly 15, andan optional handle 16. The device 10 is adapted for use with files ofvarious sizes and configurations, such as a flat file 17 having areduced cross-section butt end 18 adapted to be received in chuckassembly 15; a conical rattail file 19 having a reduced flattenedcross-sectional butt end 18, and the like.

The housing 11 is of an elongated generally cylindrical configurationhaving cylindrical side walls 21, a semi-spherical closed back end wall22, and an open front end 23 with there being defined interiorly thereofa longitudinally elongated chamber 24.

The motor 12 is of a compact electric motor designed for operation onany suitable electrical voltage, such as volts alternating current, ormay be designed for use with battery power, the motor being mounted inthe back end of the housing 11 in chamber 24 and having a drive shaft 31projecting axially from the front end thereof and terminating in avertical disposed-toothed bevel gear 32.

The drive assembly 14 consists of a horizontally disposed bevel gear 41rotatably mounted by pin 42 supported on side wall 21 with the bevelgear in meshing engagement with bevel gear 32. The bevel gear 41 has aflat circular top surface 43 on which there is mounted adjacent aperipheral edge therof a vertically extending pin 44 which is pivotallyreceived in an aperture 45 of an elongated generally longitudinallyextending drive member 46, the opposite end of the drive member providedwith an aperture extending therethrough which is pivotally connected bya pivot pin 51 to a bracket 52 affixed to a back surface 53 of the chuck15.

The chuck 15 consists of a cylindrical body member 7 55 havingcylindrical side walls 56, back surface 53,

ber is provided with a threaded aperture 61 extending radially throughside wall 56 and joining with the slot 59 inwardly of the chuck, withthere being provided a threaded Allen head-type screw 62 adapted to bethreadedly received in aperture 61 for frictionally engaging butt end 18of a file 17 for removably retaining thefile in the chuck.

As-seenin the drawings, the diameter of body member 55 of chuck 15measured by side walls 56 is adapted to be slidingly received in thefront end 23 of housingll such that the front end portion of chamber 24servesas a guide way for reciprocal movement 'of the chuck relative tothe housing.

In operation, a tile 17 is inserted in chuck l5 and retained in place byAllen head screw 62, after which the motor 12 is electrically energizedby being connected by plug 63 and cord 64 to a suitable source ofelectrical energy which is controlled through a switch 65 mounted in aside wall 21 of the housing 11. The ener-- gization of motor 12 effectsthe rotation of bevel gear 32 which, in turn, effects the rotation ofbevel gear 41 with pin 44 rotating thereabout, the pin 44 moving drivemember 46 in a general back-and-forth manner to drive chuck in areciprocal manner which, in turn, effects the reciprocation of the file17. Thus, the drive mechanism 14 converts the rotational movement ofmotor 12 to translational movement for driving the file 17. The maximumforward movement of chuck 15 is illustrated in FIG. 2 with the directionof movement being designated by arrow 70, with the maximum re-' tractedmovement of chuck 15 relative to housing 11 being illustrated in FIG. 4with the direction of movement being designated generally by arrow 71.

The handle 16 is optional and is adapted to be threaded into a portionof side wall 21 and extend normal to the axis of the housing 11 suchthat an individual may grasp the device 10 with one hand about housing-11 and a second hand stabilizing the same by handle 16 for the accurateuse of the device.

It is to be understood that the form of this invention herewithshown anddescribed is to be taken as a preferred example of the same, and thatthis invention is an elongated hollow cylindrically shaped housinghaving a closed back end, an open front end, and cylindrical side wallsurfaces;

anelongated file member having a reduced width longitudinally extendingflattened shank; anelongated cylindrically shaped compartment definedinteriorly of said housing and opening out of said open front endthereof;

a chuck disposed in said front end of said housing compartmentprojecting outwardly of said front end and guided for reciprocalmovement along the' interior front end portion of the side walls of saidcompartment in a back-and-forth manner along the;

longitudinal axis of said housing, said chuck com-. prising:

an elongated cylindrical body member having a flat front end, a flatback end, and cylindrical side walls of a diameter adapted to beslidingly received in said front end of said housing;

a diametrically extending slot extending longitudinally into said chuckthrough said chuck front end and adapted to receive therein said reducedwidth shank of said file blade member therein;

- a threaded opening disposed in said chuck side wall surfaces axiallyaligned with the diametric axis of said slot and extending radiallyoutwardly from an interior portion of said slot to a position projectingthrough said side walls of said chuck body member;

a threaded set screw having an allen head type drive socket at anexterior end thereof adapted to be threadedly received in said threadedopening and having an inner end adapted to frictionally engage an edgeof said file blade shank inserted into said slot to removably retainsaid blade affixed to said chuck for simultaneous movement therewith;

an electrically powered motor means disposed in said housing compartmentadjacent said back end thereof and having its longitudinal axis disposedparallel to the longitudinal axis of said housing compartment;

a flexible electrical cord having one end electrically connected to saidmotor with the opposite end thereof projecting outwardly of said housingback end and terminating in an electrical plug adapted to be pluggeedinto a conventional source of household electrical energy'to energizesaid motor from said electrical energy source;

an electrical switch mounted in said housing compartment and having anactuating member project ing exteriorly of said compartment side walls,said electrical switch being electrically wired in series relationshipbetween said electrical cord and said electric motor for controlling theselective energization and de-energization of said electric motor fromsaid source of electrical energy;

a shaft extending axially from a front end surface of said motorpointing in the direction of said housing open front end and rotativelydriven by said motor;

' a first bevel gear having its base portion disposed concentric andaffixed to the projecting end of said electric motor shaft;

a second bevel gear disposed at a ninety degree angle to the axis ofsaid first bevel gear and rotatively affixed to said housing forrotation interiorly of said housing compartment, said second bevel geardisposed in meshing engagement with the teeth of said first bevel gear;

said'second bevel gear having a flattened top surface disposedconcentric with the top edges of the teeth of said gear;

a cylindrical rod shaped pin member having one end affixed to aperipheral edge of said second bevel gear top flat surface with said pinmember projecting outwardly therefrom in a direction parallel to theaxis of rotation of said second bevel gear, said direction of projectionbeing normal to the plane of said second bevel gear;

a link member of an elongated flat configuration having an apertureextending through each end thereof;

ture of said link member to pivotally secure said link member thereto;

whereby rotational movement of said motor is translated by said firstand second bevel gears, said pin member, said link member, and said yoketo translational motion of said chuck relative to said housing to drivesaid chuck in a reciprocal manner inwardly and outwardly of said housingto effect reciprocal back-and-forth movement of said file blade memberaffixed to said chuck.

1. A power driven file comprising, in combination: an elongated hollowcylindrically shaped housing having a closed back end, an open frontend, and cylindrical side wall surfaces; an elongated file member havinga reduced width longitudinally extending flattened shank; an elongatedcylindrically shaped compartment defined interiorly of said housing andopening out of said open front end thereof; a chuck disposed in saidfront end of said housing compartment projecting outwardly of said frontend and guided for reciprocal movement along the interior front endportion of the side walls of said compartment in a back-and-forth manneralong the longitudinal axis of said housing, said chuck comprising: anelongated cylindrical body member having a flat front end, a flat backend, and cylindrical side walls of a diameter adapted to be slidinglyreceived in said front end of said housing; a diametrically extendingslot extending longitudinally into said chuck through said chuck frontend and adapted to receive therein said reduced width shank of said fileblade member therein; a threaded opening disposed in said chuck sidewall surfaces axially aligned with the diametric axis of said slot andextending radially outwardly from an interior portion of said slot to aposition projecting through said side walls of said chuck body member; athreaded set screw having an allen head type drive socket at an exteriorend thereof adapted to be threadedly received in said threaded openingand having an inner end adapted to frictionally engage an edge of saidfile blade shank inserted into said slot to removably retain said bladeaffixed to said chuck for simultaneous movement therewith; anelectrically powered motor means disposed in said housing compartmentadjacent said back end thereof and having its longitudinal axis disposedparallel to the longitudinal axis of said housing compartment; aflexible electrical cord having one end electrically connected to saidmotor with the opposite end thereof projecting outwardly of said housingback end and terminating in an electrical plug adapted to be pluggeedinto a conventional source of household electrical energy to energizesaid motor from said electrical energy source; an electrical switchmounted in said housing compartment and having an actuating memberprojecting exteriorly of said compartment side walls, said electricalswitch being electrically wired in series relationship between saidelectrical cord and said electric motor for controlling the selectiveenergization and de-energization of said electric motor from said sourceof electrical energy; a shaft extending axially from a front end surfaceof said motor pointing in the direction of said housing open front endand rotatively driven by said motor; a first bevel gear having its baseportion disposed concentric and affixed to the projecting end of saidelectric motor shaft; a second bevel gear disposed at a ninety degreeangle to the axis of said first bevel gear and rotatively affixed tosaid housing for rotation interiorly of said housing compartment, saidsecond bevel gear disposed in meshing engagement with the teeth of saidfirst bevel gear; said second bevel gear having a flattened top surfacedisposed concentric with the top edges of the teeth of said gear; acylindrical rod shaped pin member having one end affixed to a peripheraledge of said second bevel gear top flat surface with said pin memberprojecting outwardly therefrom in a direction parallel to the axis ofrotation of said second bevel gear, said direction of projection beingnormal to the plane of said second bevel gear; a link member of anelongated flat configuration having an aperture extending through eachend thereof; the aperture at one end of said link member rotativelyreceiving said pin member projecting therethrough; a U-shaped yokehaving a bight portion and opposed parallel leg portions, said yokebight portion affixed to said back end of said chuck with said legportions projecting outwardly therefrom straddling the axis of saidchuck; a connecting pin extending between said leg members of said yokeadjacent the outermost ends thereof; said connecting pin passing throughsaid other aperture of said link member to pivotally secure said linkmember thereto; whereby rotational movement of said motor is translatedby said first and second bevel gears, said pin member, said link member,and said yoke to translational motion of said chuck relative to saidhousing to drive said chuck in a reciprocal manner inwardly andoutwardly of said housing to effect reciprocal back-and-forth movementof said file blade member affixed to said chuck.